6 Outputs HIMatrix
Page 38 of 72 HI 800 023 E Rev. 1.01
6.7 Analog Outputs with Safety-Related Shutdown (F3 AIO 8/4 01)
The remote I/O writes to the analog outputs once per cycle and saves the values internally.
All the outputs are non-safety-related, but all together they can be shut down safely.
To achieve SIL 3, the output values must be read back via safety-related analog inputs and
evaluated in the user program. Reactions to incorrect output values must also be specified
in the user program.
6.7.1 Test Routines
The remote I/O automatically tests the two safety switches used to switch off all 4 module
outputs during operation.
6.7.2 Reaction in the Event of a Fault
If an internal fault occurs, the remote I/O simultaneously switches off all 4 output channels
via the two safety switches and reports the module fault via the FAULT LED on the front
plate.
The error code allows the user to configure additional fault reactions in the user program.
6.8 Checklist for Safety-Related Outputs
HIMA recommends using this checklist for engineering, programming and starting up
safety-related outputs. It can be used for helping with planning as well as to demonstrate
later on that the planning phase was carefully completed.
When engineering or starting up the system, a checklist must be filled out for each of the
safety-related output channels used in the system to verify the requirements to be met. This
is the only way to ensure that all requirements were considered and clearly recorded. The
checklist also documents the relationship between the external wiring and the user
program.
The checklist HIMatrix_Checklist_Outputs.doc is available in Microsoft® Word® format. All
the checklists are contained in the ZIP file HIMatrix_Checklists.zip that can be downloaded
from the HIMA website www.hima.com.
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